Make a new server

knife ec2 server create
--groups=minecraft
--image=ami-8d5069f9 --flavor=m1.small
--ssh-user=ubuntu
--ssh-key=knife --identity-file=~/.ssh/knife.pem

Which servers are up

knife ec2 server list

#Prepare server {public-ip} for use with chef knife prepare -i ~/.ssh/knife.pem ubuntu@{ip}

#Cook! knife cook ubuntu@{ip} -i ~/.ssh/knife.pem